package tools

import (
	"context"
	"encoding/json"
	"fmt"

	"github.com/voocel/agentcore/schema"
	"github.com/voocel/ainovel-cli/domain"
	"github.com/voocel/ainovel-cli/state"
)

// CommitChapterTool 提交章节：加载正文 → 保存终稿 → 生成摘要 → 更新状态 → 更新进度。
// 这是唯一允许写入 chapters/、summaries/、更新状态文件和进度的工具。
type CommitChapterTool struct {
	store *state.Store
}

func NewCommitChapterTool(store *state.Store) *CommitChapterTool {
	return &CommitChapterTool{store: store}
}

func (t *CommitChapterTool) Name() string { return "commit_chapter" }
func (t *CommitChapterTool) Description() string {
	return "提交章节。优先使用打磨版正文，同时更新时间线、伏笔、关系状态。返回结构化信号"
}
func (t *CommitChapterTool) Label() string { return "提交章节" }

func (t *CommitChapterTool) Schema() map[string]any {
	timelineSchema := schema.Object(
		schema.Property("time", schema.String("故事内时间")).Required(),
		schema.Property("event", schema.String("事件描述")).Required(),
		schema.Property("characters", schema.Array("涉及角色", schema.String(""))),
	)
	foreshadowSchema := schema.Object(
		schema.Property("id", schema.String("伏笔 ID（新埋设时自定义，推进/回收时使用已有 ID）")).Required(),
		schema.Property("action", schema.Enum("操作", "plant", "advance", "resolve")).Required(),
		schema.Property("description", schema.String("伏笔描述（仅 plant 时必需）")),
	)
	relationshipSchema := schema.Object(
		schema.Property("character_a", schema.String("角色 A")).Required(),
		schema.Property("character_b", schema.String("角色 B")).Required(),
		schema.Property("relation", schema.String("当前关系描述")).Required(),
	)
	return schema.Object(
		schema.Property("chapter", schema.Int("章节号")).Required(),
		schema.Property("summary", schema.String("本章内容摘要（200字以内）")).Required(),
		schema.Property("characters", schema.Array("本章出场角色名", schema.String(""))).Required(),
		schema.Property("key_events", schema.Array("本章关键事件", schema.String(""))).Required(),
		schema.Property("timeline_events", schema.Array("本章时间线事件", timelineSchema)),
		schema.Property("foreshadow_updates", schema.Array("伏笔操作", foreshadowSchema)),
		schema.Property("relationship_changes", schema.Array("关系变化", relationshipSchema)),
		schema.Property("hook_type", schema.Enum("章末钩子类型", "crisis", "mystery", "desire", "emotion", "choice")),
		schema.Property("dominant_strand", schema.Enum("本章主导叙事线", "quest", "fire", "constellation")),
	)
}

func (t *CommitChapterTool) Execute(_ context.Context, args json.RawMessage) (json.RawMessage, error) {
	var a struct {
		Chapter             int                        `json:"chapter"`
		Summary             string                     `json:"summary"`
		Characters          []string                   `json:"characters"`
		KeyEvents           []string                   `json:"key_events"`
		TimelineEvents      []domain.TimelineEvent     `json:"timeline_events"`
		ForeshadowUpdates   []domain.ForeshadowUpdate  `json:"foreshadow_updates"`
		RelationshipChanges []domain.RelationshipEntry `json:"relationship_changes"`
		HookType            string                     `json:"hook_type"`
		DominantStrand      string                     `json:"dominant_strand"`
	}
	if err := json.Unmarshal(args, &a); err != nil {
		return nil, fmt.Errorf("invalid args: %w", err)
	}
	if a.Chapter <= 0 {
		return nil, fmt.Errorf("chapter must be > 0")
	}
	if err := t.store.ValidateChapterCommit(a.Chapter); err != nil {
		return nil, err
	}

	// 1. 加载章节正文（polished 优先，否则 merge scenes）
	content, wordCount, err := t.store.LoadChapterContent(a.Chapter)
	if err != nil {
		return nil, fmt.Errorf("load chapter content: %w", err)
	}
	if content == "" {
		return nil, fmt.Errorf("no content found for chapter %d", a.Chapter)
	}

	// 2. 保存终稿
	if err := t.store.SaveFinalChapter(a.Chapter, content); err != nil {
		return nil, fmt.Errorf("save final chapter: %w", err)
	}

	// 3. 保存摘要
	summary := domain.ChapterSummary{
		Chapter:    a.Chapter,
		Summary:    a.Summary,
		Characters: a.Characters,
		KeyEvents:  a.KeyEvents,
	}
	if err := t.store.SaveSummary(summary); err != nil {
		return nil, fmt.Errorf("save summary: %w", err)
	}

	// 4. 更新状态增量
	if len(a.TimelineEvents) > 0 {
		for i := range a.TimelineEvents {
			a.TimelineEvents[i].Chapter = a.Chapter
		}
		if err := t.store.AppendTimelineEvents(a.TimelineEvents); err != nil {
			return nil, fmt.Errorf("append timeline: %w", err)
		}
	}
	if len(a.ForeshadowUpdates) > 0 {
		if err := t.store.UpdateForeshadow(a.Chapter, a.ForeshadowUpdates); err != nil {
			return nil, fmt.Errorf("update foreshadow: %w", err)
		}
	}
	if len(a.RelationshipChanges) > 0 {
		for i := range a.RelationshipChanges {
			a.RelationshipChanges[i].Chapter = a.Chapter
		}
		if err := t.store.UpdateRelationships(a.RelationshipChanges); err != nil {
			return nil, fmt.Errorf("update relationships: %w", err)
		}
	}

	// 5. 更新进度
	if err := t.store.MarkChapterComplete(a.Chapter, wordCount, a.HookType, a.DominantStrand); err != nil {
		return nil, fmt.Errorf("mark chapter complete: %w", err)
	}

	// 6. 判断是否需要审阅
	progress, err := t.store.LoadProgress()
	if err != nil {
		return nil, fmt.Errorf("load progress: %w", err)
	}
	completedCount := 0
	if progress != nil {
		completedCount = len(progress.CompletedChapters)
	}
	reviewRequired, reviewReason := domain.ShouldReview(completedCount)

	// 7. 计算场景数
	sceneCount := 0
	if scenes, err := t.store.LoadSceneDrafts(a.Chapter); err == nil {
		sceneCount = len(scenes)
	}

	// 8. 构造结构化信号
	result := domain.CommitResult{
		Chapter:        a.Chapter,
		Committed:      true,
		WordCount:      wordCount,
		SceneCount:     sceneCount,
		NextChapter:    a.Chapter + 1,
		ReviewRequired: reviewRequired,
		ReviewReason:   reviewReason,
		HookType:       a.HookType,
		DominantStrand: a.DominantStrand,
	}

	// 9. 写入信号文件供宿主程序读取（优先于清理操作，确保信号不丢失）
	if err := t.store.SaveLastCommit(result); err != nil {
		return nil, fmt.Errorf("save commit signal: %w", err)
	}

	// 10. 清除场景级进度（章节已提交）
	if err := t.store.ClearInProgress(); err != nil {
		return nil, fmt.Errorf("clear in-progress: %w", err)
	}

	return json.Marshal(result)
}