package gameserver

import (
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"fmt"

	"gac-hkrpg-go/internal/common"
	goproto "gac-hkrpg-go/protocol/proto"
	"google.golang.org/protobuf/proto"
)

// Initial entry presets are captured reference states, not a replacement for
// the procedural run/action processor. IDs, route displays, pending choices
// and modifiers stay in the revision-bound resource rather than handler code.
func buildCurrencyWarsInitialRun(catalog *common.CurrencyWarsCatalog, req *goproto.GridFightStartGamePlayCsReq, uniqueID uint32) (*goproto.MPIMAEMCEFH, error) {
	if catalog == nil || req == nil || uniqueID == 0 {
		return nil, fmt.Errorf("CW start inputs are incomplete")
	}
	if req.LJNGPCKPJLF != catalog.ActiveSeasonID {
		return nil, fmt.Errorf("CW requested season is not active")
	}
	raw, err := common.ReadResourceFile("resources/CurrencyWarsInitialRuns.json")
	if err != nil {
		return nil, err
	}
	var resource struct {
		Format    uint32 `json:"format_version"`
		Client    string `json:"target_client_version"`
		Assembly  string `json:"target_assembly_sha256"`
		SourceSHA string `json:"source_binary_sha256"`
		Entries   []struct {
			Division   uint32 `json:"division_id"`
			Overclock  bool   `json:"is_overclock"`
			Wire       []byte `json:"run_wire"`
			CaptureSHA string `json:"capture_sha256"`
		} `json:"entries"`
	}
	if err := json.Unmarshal(raw, &resource); err != nil {
		return nil, err
	}
	if resource.Format != 1 || resource.Client != catalog.ClientVersion || resource.Assembly != catalog.Provenance.GameAssemblySHA256 {
		return nil, fmt.Errorf("CW initial preset revision differs from the current catalog")
	}
	if h, err := hex.DecodeString(resource.SourceSHA); err != nil || len(h) != sha256.Size {
		return nil, fmt.Errorf("CW initial preset source identity is missing")
	}
	var selected *goproto.MPIMAEMCEFH
	for _, entry := range resource.Entries {
		if entry.Division != req.DivisionId || entry.Overclock != req.IsOverlock {
			continue
		}
		if selected != nil {
			return nil, fmt.Errorf("CW initial preset key is duplicated")
		}
		if h, err := hex.DecodeString(entry.CaptureSHA); err != nil || len(h) != sha256.Size {
			return nil, fmt.Errorf("CW initial preset capture identity is missing")
		}
		var run goproto.MPIMAEMCEFH
		if err := proto.Unmarshal(entry.Wire, &run); err != nil {
			return nil, fmt.Errorf("decode CW initial preset: %w", err)
		}
		if run.DivisionId != req.DivisionId || run.IsOverlock != req.IsOverlock || run.LJNGPCKPJLF != req.LJNGPCKPJLF {
			return nil, fmt.Errorf("CW initial preset identity differs from its resource key")
		}
		if err := validateCurrencyWarsEntryComponents(&run, catalog); err != nil {
			return nil, err
		}
		run.UniqueId = uniqueID
		selected = &run
	}
	if selected == nil {
		return nil, fmt.Errorf("CW requested division/mode has no captured initial preset")
	}
	cwEnsureSpotlights(selected)
	return selected, nil
}

func validateCurrencyWarsEntryComponents(run *goproto.MPIMAEMCEFH, catalog *common.CurrencyWarsCatalog) error {
	if run == nil || run.FMIGOKIDKJL == nil || run.JLDDDLDNFEF == nil || run.CAAGABEPPPE == nil {
		return fmt.Errorf("CW initial pending/context/modifier containers are missing")
	}
	var player *goproto.NIHNGPKHEPC
	var stage *goproto.BEEFLEJAOCN
	var shop *goproto.POCJDMMANBM
	for _, info := range run.NAGDJGMMCBE {
		if info == nil {
			return fmt.Errorf("CW initial component is nil")
		}
		if p := info.GetFAOCFBOFCJP(); p != nil {
			if player != nil {
				return fmt.Errorf("CW player component is duplicated")
			}
			player = p
		}
		if p := info.GetKLCPAAHDPJF(); p != nil {
			if stage != nil {
				return fmt.Errorf("CW stage component is duplicated")
			}
			stage = p
		}
		if p := info.GetEBHDIOGALIE(); p != nil {
			if shop != nil {
				return fmt.Errorf("CW shop component is duplicated")
			}
			shop = p
		}
	}
	if player == nil || stage == nil || shop == nil || shop.ABBNGCPECAI == nil {
		return fmt.Errorf("CW initial player/stage/shop is incomplete")
	}
	if player.PPKKHHNEOHB == 0 || player.GridFightLineupHp > player.PPKKHHNEOHB || player.EHNJDIDABHD == 0 || player.EHNJDIDABHD > player.NDAINFLOLPJ {
		return fmt.Errorf("CW initial health/level is invalid")
	}
	if _, err := catalog.PlayerLevel(player.EHNJDIDABHD); err != nil {
		return err
	}
	displays := make(map[currencyWarsNodeCoordinate]*goproto.OHMDHKGAEMM)
	for _, node := range stage.OOMMIIKPHBC {
		if node == nil || node.DisplayValue == nil {
			return fmt.Errorf("CW initial route node is incomplete")
		}
		coord := currencyWarsNodeCoordinate{Chapter: node.DCAHJELNJNP, Section: node.SectionId}
		if _, exists := displays[coord]; exists {
			return fmt.Errorf("CW initial route coordinate is duplicated")
		}
		if _, err := catalog.NodeTypeName(node.DisplayValue.CJCCMAACJDB); err != nil {
			return err
		}
		displays[coord] = node.DisplayValue
	}
	copyStage := proto.Clone(stage).(*goproto.BEEFLEJAOCN)
	return applyCurrencyWarsRoute(copyStage, catalog, stage.EMOHLJHPOPC, currencyWarsNodeCoordinate{Chapter: stage.DCAHJELNJNP, Section: stage.SectionId}, displays)
}

func newCurrencyWarsData(catalog *common.CurrencyWarsCatalog) (*goproto.GridFightGetDataScRsp, error) {
	// March7's freeplay profile marks the tutorial as unlocked. Without this
	// metadata the current Client sends a tutorial request (division omitted),
	// not the division selected by the normal entry page. This policy does not
	// implement or award completion of the scripted tutorial itself.
	raw, err := common.ReadResourceFile("resources/CurrencyWarsInitialRuns.json")
	if err != nil {
		return nil, err
	}
	var entry struct {
		Client   string `json:"target_client_version"`
		Assembly string `json:"target_assembly_sha256"`
		Profile  struct {
			Policy     string                          `json:"tutorial_policy"`
			Completion uint32                          `json:"tutorial_completion"`
			Season     uint32                          `json:"last_tutorial_season"`
			History    map[uint32]*goproto.GLHCHCJMFGA `json:"tutorial_history"`
		} `json:"entry_profile"`
	}
	if err := json.Unmarshal(raw, &entry); err != nil {
		return nil, err
	}
	if entry.Client != catalog.ClientVersion || entry.Assembly != catalog.Provenance.GameAssemblySHA256 || entry.Profile.Policy != "freeplay_unlocked" || entry.Profile.Completion == 0 || entry.Profile.Season != catalog.ActiveSeasonID {
		return nil, fmt.Errorf("CW entry profile revision or freeplay tutorial policy is invalid")
	}
	if len(entry.Profile.History) == 0 {
		return nil, fmt.Errorf("CW freeplay tutorial history is missing")
	}
	for season, history := range entry.Profile.History {
		if season == 0 || history == nil || history.DivisionId == 0 || history.GDAKCOICIDA == 0 {
			return nil, fmt.Errorf("CW freeplay tutorial history is incomplete")
		}
	}
	var division uint32
	for _, d := range catalog.SeasonDivisions(catalog.ActiveSeasonID) {
		if !d.IsPromotion {
			division = d.ID
			break
		}
	}
	if division == 0 {
		return nil, fmt.Errorf("CW has no initial division in active season")
	}
	return &goproto.GridFightGetDataScRsp{LFLCDNGALME: &goproto.CLEDCMIOIPF{
		PKELAIPIHMF: &goproto.CKPOBLIFMGN{FBJMBJKMAJA: entry.Profile.History, ENECKKGPKHI: entry.Profile.Season, MHFHLBHFIBC: &goproto.FMNKKAMOHEE{}},
		HFPEJIDDDJG: &goproto.AMEEHIIPMFP{GDAKCOICIDA: entry.Profile.Completion, ADFEKPNIFOJ: catalog.ActiveSeasonID, GEGMHOMNBDG: catalog.ActiveSubSeasonID, DivisionId: division, Exp: &goproto.GLIFOLCEMIN{}, MHFHLBHFIBC: &goproto.FMNKKAMOHEE{}, NLENPEPIHAC: &goproto.NMECHIFGKAD{
			DNEGDNEBJMB: &goproto.NCHKFJPOHAH{}, NIOAIKLPACM: &goproto.AHPHDNBNLPJ{}, EECJFCNKKMB: &goproto.LLBMKOILIDN{}, KJIJEGAHLGB: &goproto.GNIIDINFPDO{}, NNIJIFGJJJA: &goproto.ODKODPBCDKD{}, JLFANEOAHOC: &goproto.GKNIJKHENBF{}, EJHDGLHCNLH: &goproto.NEDHMLJKIOA{}, PJBIPMKACOF: &goproto.FCEILNCDMAH{},
		}},
	}}, nil
}