namespace FundLab.Api.Tests

open System
open System.Threading
open Xunit
open FundLab.Api

module BondQuoteProbeSupport =
    let payload (code: string) (name: string option) (price: string option) (maturity: string option) =
        let optionalText =
            function
            | Some value -> sprintf "\"%s\"" value
            | None -> "null"

        sprintf
            "{\"schema_version\":\"fund-lab.akshare.v1\",\"operation\":\"bond-quote\",\"source\":\"akshare\",\"source_revision\":\"akshare-test/eastmoney\",\"collected_at\":\"2026-09-21T08:00:00Z\",\"instrument\":{\"code\":\"%s\"},\"quote\":{\"name\":%s,\"price\":%s,\"maturity_date\":%s}}"
            code
            (optionalText name)
            (optionalText price)
            (optionalText maturity)

    let collectorReturning (fetch: unit -> Result<string, string>) =
        { new IMarketDataCollector with
            member _.Search(_, _) = Ok ""
            member _.FetchNav(_, _) = Ok ""
            member _.FetchBondQuote(_, _) = fetch ()
            member _.FetchStockQuote(_, _) = Ok "" }

    let stubProbe (getQuote: string * CancellationToken -> Result<BondQuote, MarketDataFailure>) =
        { new IBondQuoteProbe with
            member _.GetQuote(code, token) = getQuote (code, token) }

[<Collection("postgres")>]
type BondQuoteProbeTests(fixture: PostgresFixture) =
    let repository () = FundRepository(fixture.ConnectionString)

    let appWithQuote (probe: IBondQuoteProbe) =
        App.createApplicationWithProbes
            (repository ())
            { NavDates = NavDateProbeSupport.stubNavDateProbe
              NavSeries = NavDateProbeSupport.stubNavSeriesProbe
              BondQuotes = probe
              StockQuotes = NavDateProbeSupport.stubStockQuoteProbe }

    [<Fact>]
    member _.``probe parses name, price and maturity date``() =
        let json = BondQuoteProbeSupport.payload "123121" (Some "帝尔转债") (Some "101.5000") (Some "2026-06-03")

        let probe =
            AkshareBondQuoteProbe(BondQuoteProbeSupport.collectorReturning (fun () -> Ok json)) :> IBondQuoteProbe

        match probe.GetQuote("123121", CancellationToken.None) with
        | Ok quote ->
            Assert.Equal("123121", quote.Code)
            Assert.Equal<string option>(Some "帝尔转债", quote.Name)
            Assert.Equal<decimal option>(Some 101.5m, quote.Price)
            Assert.Equal<DateOnly option>(Some(DateOnly(2026, 6, 3)), quote.MaturityDate)
        | Error failure -> failwithf "expected a bond quote, got %A" failure

    [<Fact>]
    member _.``probe keeps missing fields missing instead of fabricating data``() =
        let json = BondQuoteProbeSupport.payload "123121" (Some "帝尔转债") None None

        let probe =
            AkshareBondQuoteProbe(BondQuoteProbeSupport.collectorReturning (fun () -> Ok json)) :> IBondQuoteProbe

        match probe.GetQuote("123121", CancellationToken.None) with
        | Ok quote ->
            Assert.Equal(Some "帝尔转债", quote.Name)
            Assert.Equal<decimal option>(None, quote.Price)
            Assert.Equal<DateOnly option>(None, quote.MaturityDate)
        | Error failure -> failwithf "expected a bond quote, got %A" failure

    [<Fact>]
    member _.``probe parses a spot-shaped payload where maturity is unknown``() =
        let json = BondQuoteProbeSupport.payload "110075" (Some "南航转债") (Some "106.368") None

        let probe =
            AkshareBondQuoteProbe(BondQuoteProbeSupport.collectorReturning (fun () -> Ok json)) :> IBondQuoteProbe

        match probe.GetQuote("110075", CancellationToken.None) with
        | Ok quote ->
            Assert.Equal("110075", quote.Code)
            Assert.Equal<string option>(Some "南航转债", quote.Name)
            Assert.Equal<decimal option>(Some 106.368m, quote.Price)
            Assert.Equal<DateOnly option>(None, quote.MaturityDate)
        | Error failure -> failwithf "expected a bond quote, got %A" failure

    [<Fact>]
    member _.``probe surfaces a no valid quote collector failure``() =
        let probe =
            AkshareBondQuoteProbe(
                BondQuoteProbeSupport.collectorReturning (fun () -> Error "AKShare collector failed: no valid quote for 999999")
            )
            :> IBondQuoteProbe

        match probe.GetQuote("999999", CancellationToken.None) with
        | Error(MarketDataCollectorUnavailable message) -> Assert.Contains("no valid quote for 999999", message)
        | other -> failwithf "expected MarketDataCollectorUnavailable, got %A" other

    [<Fact>]
    member _.``probe rejects a malformed bond code without touching the collector``() =
        let probe =
            AkshareBondQuoteProbe(BondQuoteProbeSupport.collectorReturning (fun () -> failwith "collector should not be called"))
            :> IBondQuoteProbe

        match probe.GetQuote("abc", CancellationToken.None) with
        | Error(InvalidMarketDataRequest message) -> Assert.Contains("six digits", message)
        | other -> failwithf "expected InvalidMarketDataRequest, got %A" other

    [<Fact>]
    member _.``probe maps collector failures to an unavailable reason and does not cache them``() =
        let mutable calls = 0

        let collector =
            BondQuoteProbeSupport.collectorReturning (fun () ->
                calls <- calls + 1
                Error "collector exited with code 2")

        let probe = AkshareBondQuoteProbe(collector) :> IBondQuoteProbe

        match probe.GetQuote("123121", CancellationToken.None) with
        | Error(MarketDataCollectorUnavailable message) -> Assert.Contains("code 2", message)
        | other -> failwithf "expected MarketDataCollectorUnavailable, got %A" other

        match probe.GetQuote("123121", CancellationToken.None) with
        | Error(MarketDataCollectorUnavailable _) -> ()
        | other -> failwithf "expected MarketDataCollectorUnavailable, got %A" other

        Assert.Equal(2, calls)

    [<Fact>]
    member _.``probe maps malformed payloads to an invalid payload reason``() =
        let probe =
            AkshareBondQuoteProbe(BondQuoteProbeSupport.collectorReturning (fun () -> Ok "{not-json")) :> IBondQuoteProbe

        match probe.GetQuote("123121", CancellationToken.None) with
        | Error(InvalidMarketDataPayload _) -> ()
        | other -> failwithf "expected InvalidMarketDataPayload, got %A" other

    [<Fact>]
    member _.``probe memoises successful lookups per bond code``() =
        let mutable calls = 0

        let collector =
            BondQuoteProbeSupport.collectorReturning (fun () ->
                calls <- calls + 1
                Ok(BondQuoteProbeSupport.payload "123121" (Some "帝尔转债") None None))

        let probe = AkshareBondQuoteProbe(collector) :> IBondQuoteProbe

        let first = probe.GetQuote("123121", CancellationToken.None)
        let second = probe.GetQuote("123121", CancellationToken.None)

        Assert.Equal(1, calls)
        Assert.Equal(first |> Result.map (fun quote -> quote.Code), second |> Result.map (fun quote -> quote.Code))

    [<Fact>]
    member _.``market bond-quote endpoint returns the probe record``() =
        let probe =
            BondQuoteProbeSupport.stubProbe (fun (code, _) ->
                Assert.Equal("123121", code)

                Ok
                    {
                        Code = "123121"
                        Name = Some "帝尔转债"
                        Price = Some 101.5m
                        MaturityDate = Some(DateOnly(2026, 6, 3))
                    })

        let status, body =
            PersistenceTestHelpers.invoke
                (appWithQuote probe)
                "GET"
                "/api/market/bond-quote?code=123121"
                [ "Authorization", "Bearer test-token" ]
                ""

        Assert.Equal(200, status)
        Assert.Contains("\"code\":\"123121\"", body)
        Assert.Contains("\"name\":\"帝尔转债\"", body)
        Assert.Contains("101.5", body)
        Assert.Contains("\"maturityDate\":\"2026-06-03\"", body)

    [<Fact>]
    member _.``market bond-quote endpoint answers 503 when the probe fails``() =
        let probe =
            BondQuoteProbeSupport.stubProbe (fun _ -> Error(MarketDataCollectorUnavailable "collector exited with code 2"))

        let status, body =
            PersistenceTestHelpers.invoke
                (appWithQuote probe)
                "GET"
                "/api/market/bond-quote?code=123121"
                [ "Authorization", "Bearer test-token" ]
                ""

        Assert.Equal(503, status)
        Assert.Contains("MARKET_DATA_UNAVAILABLE", body)
        Assert.Contains("code 2", body)

    [<Fact>]
    member _.``market bond-quote endpoint rejects a malformed code with 400``() =
        let probe =
            BondQuoteProbeSupport.stubProbe (fun _ ->
                Error(InvalidMarketDataRequest "bond code must contain exactly six digits"))

        let status, body =
            PersistenceTestHelpers.invoke
                (appWithQuote probe)
                "GET"
                "/api/market/bond-quote?code=abc"
                [ "Authorization", "Bearer test-token" ]
                ""

        Assert.Equal(400, status)
        Assert.Contains("INVALID_MARKET_DATA_REQUEST", body)