path: root/src/LivingVillage.Desktop/Interaction.fs

namespace LivingVillage.Desktop

open System
open LivingVillage.Kernel
open LivingVillage.Kernel.Sim
open LivingVillage.Desktop.VillagePresentation

type InteractionAction =
    | TalkTo of NpcId
    | EnterHome of HomeId
    | ExitHome of HomeId

type InteractionTarget =
    { Action: InteractionAction
      Position: Vec2
      Text: string
      DistanceSquared: float32 }

type M5Panel =
    | WorldPanel
    | NeedsPanel
    | ObservationPanel
    | DialoguePanel
    | ChroniclePanel
    | TaskPanel

type M5Command =
    | Interact
    | Intent1
    | Intent2
    | Intent3
    | Intent4
    | Intent5
    | Intent6
    | Observe
    | ToggleNeeds
    | ShowChronicle
    | ShowTaskPanel
    | ClosePanel

type M5View =
    { Panel: M5Panel
      Menu: DialogueMenu option
      Needs: NeedsPanel option
      Observations: Observation list
      Chronicle: string
      Status: string
      StatusTick: int64 option
      HomeMode: HomeMode
      Prompt: string option
      PromptTargetPos: Vec2 option
      Task: Occupation.State option
      /// 世界种子（与 Game.fs 的开局种子同源），供剧情线开线日哈希使用。
      Seed: uint64 }

module InteractionResolver =

    let private tileCenter (tile: TilePosition) : Vec2 =
        { X = float32 (tile.X * Sim.tilePixels + Sim.tilePixels / 2)
          Y = float32 (tile.Y * Sim.tilePixels + Sim.tilePixels / 2) }

    let private homeDoorPosition (home: Home) : Vec2 =
        home.Door |> worldTileForSceneTile |> tileCenter

    let private blockingTiles : Set<int * int> =
        scene.Elements
        |> List.choose (fun element ->
            match element.Prop with
            | WhiteWallDarkTileHome ->
                let tile = worldTileForSceneTile element.Position
                Some(tile.X, tile.Y)
            | _ -> None)
        |> Set.ofList

    let private tileAt (position: Vec2) : int * int =
        int (Math.Floor(float position.X / float Sim.tilePixels)),
        int (Math.Floor(float position.Y / float Sim.tilePixels))

    let hasClearPath (fromPosition: Vec2) (targetPosition: Vec2) : bool =
        let dx = targetPosition.X - fromPosition.X
        let dy = targetPosition.Y - fromPosition.Y
        let distance = sqrt (dx * dx + dy * dy)
        let steps = max 1 (int (Math.Ceiling(float (distance / float32 Sim.tilePixels * 4.0f))))
        [ 1 .. steps - 1 ]
        |> List.forall (fun step ->
            let fraction = float32 step / float32 steps
            let sample : Vec2 =
                { X = fromPosition.X + dx * fraction
                  Y = fromPosition.Y + dy * fraction }
            not (Set.contains (tileAt sample) blockingTiles))

    let private distanceSquared (first: Vec2) (second: Vec2) : float32 =
        let dx = second.X - first.X
        let dy = second.Y - first.Y
        dx * dx + dy * dy

    let private dialogueAvailable (npc: Npc) : bool =
        npc.Mind.Action <> Sleep && npc.Mind.Action <> Chat

    let private npcNumber (NpcId id) = id

    let private target action position text avatarPosition : InteractionTarget =
        { Action = action
          Position = position
          Text = text
          DistanceSquared = distanceSquared avatarPosition position }

    let private targetIsReachable (avatarPosition: Vec2) (position: Vec2) : bool =
        distanceSquared avatarPosition position <= Sim.chatRangeSq
        && hasClearPath avatarPosition position

    let resolve (world: World) (homeMode: HomeMode) : InteractionTarget option =
        let avatarPosition = world.Avatar.Pos
        let candidates =
            match homeMode with
            | Inside homeId ->
                scene.Homes
                |> List.choose (fun home ->
                    if home.Id = homeId then
                        let position = homeDoorPosition home
                        let avatarTile =
                            sceneTileFromPixel { X = avatarPosition.X; Y = avatarPosition.Y }
                        if isNearHomeDoor avatarTile home && targetIsReachable avatarPosition position then
                            Some(target (ExitHome home.Id) position "E 出屋" avatarPosition)
                        else None
                    else None)
            | Outside ->
                let homes =
                    scene.Homes
                    |> List.choose (fun home ->
                        let position = homeDoorPosition home
                        let avatarTile =
                            sceneTileFromPixel { X = avatarPosition.X; Y = avatarPosition.Y }
                        if isNearHomeDoor avatarTile home && targetIsReachable avatarPosition position then
                            Some(target (EnterHome home.Id) position "E 进屋" avatarPosition)
                        else None)
                let npcs =
                    world.Npcs
                    |> Array.choose (fun npc ->
                        if dialogueAvailable npc && targetIsReachable avatarPosition npc.Pos then
                            Some(target (TalkTo npc.Id) npc.Pos "E 交谈" avatarPosition)
                        else None)
                    |> Array.toList
                homes @ npcs

        candidates
        |> List.sortBy (fun candidate ->
            let stableId =
                match candidate.Action with
                | TalkTo id -> npcNumber id
                | EnterHome(HomeId id)
                | ExitHome(HomeId id) -> id
            candidate.DistanceSquared, stableId)
        |> List.tryHead

    let resolveAction = resolve

module FloatingPrompt =

    type PromptRect =
        { X: int
          Y: int
          Width: int
          Height: int }

    // HUD exclusion geometry shared with the Game.fs renderer: full-width top status bar
    // and the bottom-left lightweight panel band.
    let hudTopBarHeight = 39
    let hudBottomBandHeight = 160

    /// Width of text as PixelText.draw advances it (scale applied, CJK 8px, latin 6px, space 4px).
    let measureWidth (text: string) (scale: int) : int =
        text.ToUpperInvariant()
        |> Seq.fold (fun cursor character ->
            if character = ' ' then cursor + 4 * scale
            elif CjkGlyphAtlas.sourceRectangle character |> Option.isSome then cursor + 8 * scale
            else cursor + 6 * scale) 0

    /// Anchor the one short prompt above the unique target: horizontally centered on the
    /// entity, clamped inside the viewport, and never covering either HUD band.
    let layout
        (viewportWidth: int)
        (viewportHeight: int)
        (anchorWorldX: float32)
        (anchorWorldY: float32)
        (cameraX: float32)
        (cameraY: float32)
        (scale: int)
        (text: string) : PromptRect =
        let width = measureWidth text scale
        let height = 8 * scale + 10
        let margin = 8
        let screenX = int anchorWorldX - int cameraX - width / 2
        let screenY = int anchorWorldY - int cameraY - 56
        let x =
            if width + margin * 2 > viewportWidth then margin
            else max margin (min (viewportWidth - margin - width) screenX)
        let topSafe = hudTopBarHeight + margin
        let bottomSafe = viewportHeight - hudBottomBandHeight - height - margin
        let y = max topSafe (min bottomSafe screenY)
        { X = x; Y = y; Width = width; Height = height }

module M5Interaction =

    let initial : M5View =
        { Panel = WorldPanel
          Menu = None
          Needs = None
          Observations = []
          Chronicle = ""
          Status = "ready"
          StatusTick = None
          HomeMode = Outside
          Prompt = None
          PromptTargetPos = None
          Task = None
          Seed = 42UL }

    let worldInputAllowed (view: M5View) : bool =
        view.Panel = WorldPanel

    let refreshPrompt (world: World) (view: M5View) : M5View =
        if worldInputAllowed view then
            let resolved = InteractionResolver.resolve world view.HomeMode
            { view with
                Prompt = resolved |> Option.map (fun target -> target.Text)
                PromptTargetPos = resolved |> Option.map (fun target -> target.Position) }
        else
            { view with Prompt = None; PromptTargetPos = None }

    let resolveAction (world: World) (homeMode: HomeMode) : InteractionTarget option =
        InteractionResolver.resolveAction world homeMode

    let private observationBounds (world: World) : VisibleBounds =
        let radius = Sim.chatRangePx
        { Min = { X = world.Avatar.Pos.X - radius; Y = world.Avatar.Pos.Y - radius }
          Max = { X = world.Avatar.Pos.X + radius; Y = world.Avatar.Pos.Y + radius } }

    let private menuStatus (menu: DialogueMenu) : string =
        sprintf "dialogue target=%A options=%d; press 1-6" menu.Target menu.Options.Length

    let private intentName (intent: DialogueIntent) : string =
        match intent with
        | SmallTalk -> "闲聊"
        | AskHelp -> "求助"
        | OfferTrade -> "提议交易"
        | Joke -> "讲笑话"
        | Apologize -> "道歉"
        | Provoke -> "挑衅"

    let private needName (kind: NeedKind) : string =
        match kind with
        | HungerNeed -> "饥饿"
        | EnergyNeed -> "精力"
        | SocialNeed -> "社交"
        | MoneyNeed -> "金钱"

    let private itemName (item: ItemKind) : string =
        match item with
        | Food -> "食物"
        | Fish -> "鱼"
        | Spice -> "香料"
        | Scroll -> "卷轴"

    let private responseName (response: DialogueResponse) : string =
        match response with
        | Friendly -> "友好"
        | Helpful -> "乐于助人"
        | Bargaining -> "讨价还价"
        | Amused -> "开心"
        | Forgiving -> "原谅"
        | Hostile -> "敌意"
        | Reserved -> "保留"
        | Refused -> "拒绝"
        | Offended -> "恼怒"

    let private dialogueFailureName (failure: DialogueFailure) : string =
        match failure with
        | DialogueTargetNotFound -> "找不到目标"
        | DialogueTargetOutOfRange -> "目标不在范围内"
        | DialogueTargetUnavailable -> "目标暂时无法互动"

    let private tradeFailureName (failure: TradeFailure) : string =
        match failure with
        | BuyerNotFound -> "找不到买家"
        | SellerNotFound -> "找不到卖家"
        | SameParticipant -> "买家和卖家不能是同一人"
        | InvalidQuantity -> "数量必须大于零"
        | OutOfStock -> "库存不足"
        | InsufficientFunds -> "资金不足"

    let private npcNumber (NpcId id) = id

    let menuNpcNumber (menu: DialogueMenu) : int = npcNumber menu.Target

    let intentLine (intent: DialogueIntent) : string = intentName intent

    let private chooseIntent (index: int) (world: World) (view: M5View) : World * M5View =
        match view.Menu with
        | None -> world, { view with Status = "no dialogue menu; press E near an NPC" }
        | Some menu ->
            match List.tryItem index menu.Options with
            | None -> world, { view with Status = "invalid dialogue option" }
            | Some intent ->
            // P-d：回应经职业偏差纯函数；无职业走既有 identity 路径（逐字节不变）。
            let respond =
                match view.Task with
                | Some task -> Occupation.biasResponse (Some task.Profile.Kind)
                | None -> Sim.responseFor
            match Sim.chooseDialogueWith respond menu.Target intent world with
                | DialogueSucceeded(outcome, next) ->
                    // P-d 剧情线：每次玩家对话至多推进一段，摘要写年鉴（StoryAnnal）。
                    let storyWorld, storyTask =
                        match view.Task with
                        | Some task ->
                            let nextState, summary = Occupation.Story.onDialogue view.Seed task next
                            let withAnnal =
                                match summary with
                                | Some text ->
                                    Sim.appendAnnal
                                        { Tick = next.Tick; Kind = StoryAnnal; Summary = text }
                                        next
                                | None -> next
                            withAnnal, Some nextState
                        | None -> next, None
                    storyWorld,
                    { view with
                        Panel = WorldPanel
                        Menu = None
                        Chronicle = Sim.annalText storyWorld
                        Prompt = None
                        PromptTargetPos = None
                        Task = storyTask
                        Status = sprintf "dialogue intent=%A response=%A" outcome.Intent outcome.Response
                        StatusTick = Some storyWorld.Tick }
                | DialogueRejected(failure, next) ->
                    next,
                    { view with
                        Panel = WorldPanel
                        Menu = None
                        Prompt = None
                        PromptTargetPos = None
                        Status = sprintf "dialogue rejected: %s" (dialogueFailureName failure)
                        StatusTick = Some next.Tick }

    let private commandAllowed (command: M5Command) (view: M5View) : bool =
        match command with
        | ClosePanel -> true
        | Interact -> view.Panel = WorldPanel
        | Intent1
        | Intent2
        | Intent3
        | Intent4
        | Intent5
        | Intent6 -> view.Panel = DialoguePanel
        | Observe
        | ToggleNeeds
        | ShowChronicle
        | ShowTaskPanel -> view.Panel <> DialoguePanel

    let private applyAllowed (command: M5Command) (world: World) (view: M5View) : World * M5View =
        match command with
        | Interact ->
            match InteractionResolver.resolve world view.HomeMode with
            | Some { Action = TalkTo target } ->
                let menu = { Target = target; Options = Sim.dialogueOptions }
                world,
                { view with
                    Panel = DialoguePanel
                    Menu = Some menu
                    Prompt = None
                    PromptTargetPos = None
                    Status = menuStatus menu }
            | Some { Action = EnterHome _ } ->
                let pixel = { PixelPosition.X = world.Avatar.Pos.X; Y = world.Avatar.Pos.Y }
                let scenePosition = sceneTileFromPixel pixel
                match enterHome scenePosition view.HomeMode with
                | Ok nextMode ->
                    world,
                    { view with
                        Panel = WorldPanel
                        Menu = None
                        HomeMode = nextMode
                        Prompt = None
                        PromptTargetPos = None
                        Status = "home entered" }
                | Error failure -> world, { view with Prompt = None; Status = sprintf "home entry rejected: %A" failure }
            | Some { Action = ExitHome _ } ->
                match exitHome view.HomeMode with
                | Ok nextMode ->
                    world,
                    { view with
                        Panel = WorldPanel
                        Menu = None
                        HomeMode = nextMode
                        Prompt = None
                        PromptTargetPos = None
                        Status = "home exited" }
                | Error failure -> world, { view with Prompt = None; Status = sprintf "home exit rejected: %A" failure }
            | None ->
                world,
                { view with Panel = WorldPanel; Menu = None; Prompt = None; Status = "no nearby interaction" }
        | Intent1 -> chooseIntent 0 world view
        | Intent2 -> chooseIntent 1 world view
        | Intent3 -> chooseIntent 2 world view
        | Intent4 -> chooseIntent 3 world view
        | Intent5 -> chooseIntent 4 world view
        | Intent6 -> chooseIntent 5 world view
        | Observe ->
            let observations = Sim.observeVisible (observationBounds world) world
            world,
                { view with
                    Panel = ObservationPanel
                    Observations = observations
                    Prompt = None
                    PromptTargetPos = None
                    Status = sprintf "observation visible_npcs=%d" observations.Length }
        | ToggleNeeds ->
            if view.Panel = NeedsPanel then
                world, refreshPrompt world { view with Panel = WorldPanel; Needs = None; Status = "needs panel closed" }
            else
                world,
                { view with
                    Panel = NeedsPanel
                    Needs = Some(Sim.needsPanel world)
                    Prompt = None
                    PromptTargetPos = None
                    Status = "needs panel open" }
        | ShowChronicle ->
            world,
            { view with
                Panel = ChroniclePanel
                Chronicle = Sim.annalText world
                Prompt = None
                PromptTargetPos = None
                Status = sprintf "chronicle entries=%d" world.Annals.Length }
        | ShowTaskPanel ->
            world,
            { view with
                Panel = TaskPanel
                Prompt = None
                PromptTargetPos = None
                Status = "task panel open" }
        | ClosePanel -> world, refreshPrompt world { view with Panel = WorldPanel; Menu = None; Status = "panel closed" }

    let apply (command: M5Command) (world: World) (view: M5View) : World * M5View =
        if commandAllowed command view then
            let nextWorld, nextView = applyAllowed command world view
            let stamped =
                if nextView.Status <> view.Status && Option.isNone nextView.StatusTick then
                    { nextView with StatusTick = Some nextWorld.Tick }
                else
                    nextView
            nextWorld, stamped
        else
            world, view

    let statusDisplayDurationTicks = 150L

    let tradeResultText (request: TradeRequest) (quote: float32 option) (result: TradeResult) : string =
        match result with
        | TradeSucceeded _ ->
            match quote with
            | Some unitPrice ->
                sprintf "交易成功：%s ×%d，报价 %.2f，总价 %.2f"
                    (itemName request.Item)
                    request.Quantity
                    unitPrice
                    (unitPrice * float32 request.Quantity)
            | None -> sprintf "交易成功：%s ×%d" (itemName request.Item) request.Quantity
        | TradeRejected(failure, _) -> sprintf "交易失败：%s" (tradeFailureName failure)

    let panelName (view: M5View) : string =
        match view.Panel with
        | WorldPanel -> "world"
        | NeedsPanel -> "needs"
        | ObservationPanel -> "observation"
        | DialoguePanel -> "dialogue"
        | ChroniclePanel -> "chronicle"
        | TaskPanel -> "task"

    let titleText (view: M5View) : string =
        match view.Panel with
        | WorldPanel -> "江南水乡"
        | NeedsPanel -> "需求 | TAB 关闭 | Q 观察 | C 年鉴"
        | ObservationPanel -> "观察 | TAB 需求 | C 年鉴 | ESC 关闭"
        | DialoguePanel ->
            match view.Menu with
            | Some menu ->
                let options =
                    menu.Options
                    |> List.mapi (fun index intent -> sprintf "%d %s" (index + 1) (intentName intent))
                    |> String.concat " | "
                sprintf "互动：村民 %d | %s | ESC 关闭" (npcNumber menu.Target) options
            | None -> "互动已记录 | E 互动 | ESC 关闭"
        | ChroniclePanel -> "年鉴 | TAB 需求 | Q 观察 | ESC 关闭"
        | TaskPanel -> "任务 | TAB 需求 | Q 观察 | ESC 关闭"

    let private statusLabel (status: string) : string =
        match status with
        | "ready" -> "准备就绪"
        | "needs panel open" -> "需求面板已打开"
        | "needs panel closed" -> "需求面板已关闭"
        | "panel closed" -> "面板已关闭"
        | "home entered" -> "已进入民居"
        | "home exited" -> "已离开民居"
        | "save succeeded" -> "保存成功"
        | "save failed" -> "保存失败"
        | value when value.StartsWith("dialogue target=") -> "请选择对话方式"
        | value when value.StartsWith("dialogue intent=") -> "对话完成"
        | value when value.StartsWith("dialogue rejected:") ->
            let reason = value.Substring("dialogue rejected:".Length).Trim()
            if String.IsNullOrWhiteSpace reason then "对话失败" else sprintf "对话失败：%s" reason
        | value when value.StartsWith("observation") -> "观察完成"
        | value when value.StartsWith("chronicle") -> "年鉴已打开"
        | "task panel open" -> "任务面板已打开"
        | value when value.StartsWith("no dialogue") -> "当前没有可用对话"
        | value when value.StartsWith("invalid dialogue") -> "对话选项无效"
        | value when value.StartsWith("no nearby") -> "附近没有可互动目标"
        | _ -> "状态已更新"

    let statusText (view: M5View) : string =
        if String.IsNullOrWhiteSpace view.Status then "准备就绪" else statusLabel view.Status

    let transientStatusLine (nowTick: int64) (view: M5View) : string option =
        match view.StatusTick with
        | Some tick when view.Panel = WorldPanel && nowTick - tick < statusDisplayDurationTicks ->
            Some(statusText view)
        | _ -> None

    /// Minimal corner status for the persistent HUD: day counter plus money/energy taken
    /// directly from the avatar's real needs (no invented values).
    let cornerStatusLines (world: World) : string list =
        let day = world.Tick / Sim.ticksPerDay + 1L
        let needs = world.Avatar.Mind.Needs
        [ sprintf "天数 %d" day
          sprintf "金钱 %.0f / 精力 %.0f" needs.Money needs.Energy ]

    let private annalLine (entry: AnnalEntry) : string =
        match entry.Kind with
        | DialogueAnnal outcome ->
            sprintf "对话：村民 %d 对村民 %d 使用%s，回应%s"
                (npcNumber outcome.Actor)
                (npcNumber outcome.Target)
                (intentName outcome.Intent)
                (responseName outcome.Response)
        | RumorAnnal rumor ->
            sprintf "传闻：村民 %d 传给村民 %d，传播 %d 层"
                (npcNumber rumor.Narrator)
                (npcNumber rumor.Receiver)
                rumor.Depth
        | TradeAnnal event ->
            match event.Kind with
            | TradeEvent(buyer, seller, item, quantity, unitPrice) ->
                sprintf "交易：村民 %d 从村民 %d 获得%s ×%d，单价 %.2f"
                    (npcNumber buyer)
                    (npcNumber seller)
                    (itemName item)
                    quantity
                    unitPrice
            | _ -> "交易记录"
        | StoryAnnal -> entry.Summary

    let private chronicleLines (world: World) : string list =
        world.Annals
        |> List.rev
        |> List.truncate 10
        |> List.map annalLine

    let panelLines (world: World) (view: M5View) : string list =
        let status = statusText view
        match view.Panel with
        | WorldPanel ->
            (view.Prompt |> Option.toList)
            @ (transientStatusLine world.Tick view |> Option.toList)
        | NeedsPanel ->
            match view.Needs with
            | None -> [ "需求"; "暂无数据"; status ]
            | Some panel ->
                let topNeed =
                    panel.Ranked
                    |> List.tryHead
                    |> Option.map (fun score -> sprintf "最紧迫：%s" (needName score.Kind))
                    |> Option.defaultValue "暂无紧迫需求"
                [ "需求"
                  sprintf "饥饿 %.0f" panel.Needs.Hunger
                  sprintf "精力 %.0f" panel.Needs.Energy
                  sprintf "社交 %.0f" panel.Needs.Social
                  sprintf "金钱 %.0f" panel.Needs.Money
                  topNeed
                  status ]
        | ObservationPanel ->
            let rows =
                view.Observations
                |> List.truncate 8
                |> List.collect (fun observation ->
                    let urgency =
                        observation.Ranked
                        |> List.tryHead
                        |> Option.map (fun score -> score.Urgency)
                        |> Option.defaultValue 0.0f
                    [ sprintf "村民 %d 紧迫度 %.0f" (npcNumber observation.Id) urgency
                      sprintf "饥饿 %.0f 精力 %.0f 社交 %.0f 金钱 %.0f"
                          observation.Needs.Hunger
                          observation.Needs.Energy
                          observation.Needs.Social
                          observation.Needs.Money ])
            "观察" :: (if rows.IsEmpty then [ "范围内暂无村民" ] else rows) @ [ status ]
        | DialoguePanel ->
            match view.Menu with
            | None -> [ "互动已记录"; status ]
            | Some menu ->
                let options =
                    menu.Options
                    |> List.mapi (fun index intent -> sprintf "%d %s" (index + 1) (intentName intent))
                [ sprintf "互动：村民 %d" (npcNumber menu.Target) ] @ options @ [ "ESC 关闭"; status ]
        | ChroniclePanel ->
            let entries = chronicleLines world
            "年鉴" :: (if entries.IsEmpty then [ "暂无记录" ] else entries) @ [ status ]
        | TaskPanel ->
            let taskStateText (state: Occupation.TaskState) : string =
                match state with
                | Occupation.Offered -> "待接受"
                | Occupation.Active -> "进行中"
                | Occupation.Done -> "已完成"
                | Occupation.Failed -> "已失败"
            match view.Task with
            | None -> [ "任务"; "无职业"; status ]
            | Some occupationState ->
                let taskLines =
                    match occupationState.Today with
                    | None -> [ "今日暂无任务" ]
                    | Some task ->
                        [ sprintf "%s：%s" (Occupation.taskNameOf task.TemplateId) (taskStateText task.State) ]
                let storyLine =
                    sprintf "剧情线：%s，%s"
                        (Occupation.Story.lineNameOf occupationState.Profile.Kind)
                        (Occupation.Story.stageNameOf occupationState.StoryStage)
                Occupation.nameOf occupationState.Profile.Kind :: taskLines @ [ storyLine ] @ [ status ]