import { randomUUID } from 'crypto'
import type {
  AutoWritingConfig,
  InteractiveFlow,
  InteractiveFlowStatus,
  InteractiveScene,
  NamingPause,
  WizardWritingConfig,
  WritingFlowMode,
  WritingStep
} from '../../../shared/types'
import type { SqliteDb } from '../types'

export class InteractiveRepository {
  constructor(private db: SqliteDb) {}

  getBySession(sessionId: string): InteractiveFlow | null {
    const row = this.db
      .prepare(
        `SELECT * FROM interactive_flows WHERE session_id = ? AND status = 'in_progress' ORDER BY updated_at DESC LIMIT 1`
      )
      .get(sessionId) as Record<string, unknown> | undefined
    return row ? this.mapFlow(row) : null
  }

  get(flowId: string): InteractiveFlow | null {
    const row = this.db.prepare('SELECT * FROM interactive_flows WHERE id = ?').get(flowId) as
      | Record<string, unknown>
      | undefined
    return row ? this.mapFlow(row) : null
  }

  create(
    sessionId: string,
    flowMode: WritingFlowMode = 'interactive',
    initialStep?: WritingStep
  ): InteractiveFlow {
    const id = randomUUID()
    const step =
      initialStep ??
      (flowMode === 'auto'
        ? 'goal_setup'
        : flowMode === 'wizard'
          ? 'wizard_goal'
          : 'context_confirm')
    this.db
      .prepare(
        `INSERT INTO interactive_flows (id, session_id, step, status, context_json, flow_mode, mode_config_json)
         VALUES (?, ?, ?, 'in_progress', '{}', ?, '{}')`
      )
      .run(id, sessionId, step, flowMode)
    return this.get(id)!
  }

  resetInProgress(sessionId: string, flowMode: WritingFlowMode = 'interactive'): InteractiveFlow {
    this.db
      .prepare(
        `UPDATE interactive_flows SET status = 'abandoned', updated_at = datetime('now') WHERE session_id = ? AND status = 'in_progress'`
      )
      .run(sessionId)
    return this.create(sessionId, flowMode)
  }

  updateStep(
    flowId: string,
    step: WritingStep,
    patch: {
      contextJson?: string
      plotSelectionJson?: string | null
      namingPendingJson?: string | null
      sceneDraftHtml?: string | null
      modeConfigJson?: string
      flowMode?: WritingFlowMode
      status?: InteractiveFlowStatus
    } = {}
  ): InteractiveFlow {
    const sets: string[] = ['step = ?', `updated_at = datetime('now')`]
    const vals: unknown[] = [step]
    if (patch.contextJson !== undefined) {
      sets.push('context_json = ?')
      vals.push(patch.contextJson)
    }
    if (patch.plotSelectionJson !== undefined) {
      sets.push('plot_selection_json = ?')
      vals.push(patch.plotSelectionJson)
    }
    if (patch.namingPendingJson !== undefined) {
      sets.push('naming_pending_json = ?')
      vals.push(patch.namingPendingJson)
    }
    if (patch.sceneDraftHtml !== undefined) {
      sets.push('scene_draft_html = ?')
      vals.push(patch.sceneDraftHtml)
    }
    if (patch.modeConfigJson !== undefined) {
      sets.push('mode_config_json = ?')
      vals.push(patch.modeConfigJson)
    }
    if (patch.flowMode !== undefined) {
      sets.push('flow_mode = ?')
      vals.push(patch.flowMode)
    }
    if (patch.status !== undefined) {
      sets.push('status = ?')
      vals.push(patch.status)
    }
    vals.push(flowId)
    this.db.prepare(`UPDATE interactive_flows SET ${sets.join(', ')} WHERE id = ?`).run(...vals)
    return this.get(flowId)!
  }

  getModeConfig<T extends AutoWritingConfig | WizardWritingConfig>(
    flowId: string
  ): T {
    const row = this.db
      .prepare('SELECT mode_config_json FROM interactive_flows WHERE id = ?')
      .get(flowId) as { mode_config_json: string } | undefined
    try {
      return JSON.parse(row?.mode_config_json ?? '{}') as T
    } catch {
      return {} as T
    }
  }

  setModeConfig(flowId: string, config: AutoWritingConfig | WizardWritingConfig): void {
    this.db
      .prepare(
        `UPDATE interactive_flows SET mode_config_json = ?, updated_at = datetime('now') WHERE id = ?`
      )
      .run(JSON.stringify(config), flowId)
  }

  listScenes(flowId: string): InteractiveScene[] {
    const rows = this.db
      .prepare('SELECT * FROM interactive_scenes WHERE flow_id = ? ORDER BY sort_order')
      .all(flowId) as Record<string, unknown>[]
    return rows.map((r) => ({
      id: r.id as string,
      sortOrder: r.sort_order as number,
      contentHtml: r.content_html as string,
      plotLabel: r.plot_label as string,
      refinedCount: r.refined_count as number
    }))
  }

  addScene(flowId: string, contentHtml: string, plotLabel: string): InteractiveScene {
    const id = randomUUID()
    const max = this.db
      .prepare('SELECT COALESCE(MAX(sort_order), -1) AS m FROM interactive_scenes WHERE flow_id = ?')
      .get(flowId) as { m: number }
    const sortOrder = max.m + 1
    this.db
      .prepare(
        `INSERT INTO interactive_scenes (id, flow_id, sort_order, content_html, plot_label) VALUES (?, ?, ?, ?, ?)`
      )
      .run(id, flowId, sortOrder, contentHtml, plotLabel)
    return this.listScenes(flowId).find((s) => s.id === id)!
  }

  updateSceneContent(flowId: string, sceneId: string, contentHtml: string, refinedCount: number): void {
    this.db
      .prepare(
        `UPDATE interactive_scenes SET content_html = ?, refined_count = ? WHERE id = ? AND flow_id = ?`
      )
      .run(contentHtml, refinedCount, sceneId, flowId)
  }

  getSceneDraft(flowId: string): string {
    const row = this.db
      .prepare('SELECT scene_draft_html FROM interactive_flows WHERE id = ?')
      .get(flowId) as { scene_draft_html: string | null } | undefined
    return row?.scene_draft_html ?? ''
  }

  setSceneDraft(flowId: string, html: string): void {
    this.db
      .prepare(`UPDATE interactive_flows SET scene_draft_html = ?, updated_at = datetime('now') WHERE id = ?`)
      .run(html, flowId)
  }

  getPlotSelection(flowId: string): string {
    const row = this.db
      .prepare('SELECT plot_selection_json FROM interactive_flows WHERE id = ?')
      .get(flowId) as { plot_selection_json: string | null } | undefined
    return row?.plot_selection_json ?? '{}'
  }

  getContextJson(flowId: string): string {
    const row = this.db
      .prepare('SELECT context_json FROM interactive_flows WHERE id = ?')
      .get(flowId) as { context_json: string } | undefined
    return row?.context_json ?? '{}'
  }

  private mapFlow(row: Record<string, unknown>): InteractiveFlow {
    const flowId = row.id as string
    let namingPending: NamingPause | null = null
    if (row.naming_pending_json) {
      try {
        namingPending = JSON.parse(row.naming_pending_json as string) as NamingPause
      } catch {
        namingPending = null
      }
    }
    let modeConfig: AutoWritingConfig | WizardWritingConfig | Record<string, never> = {}
    try {
      modeConfig = JSON.parse((row.mode_config_json as string) ?? '{}')
    } catch {
      modeConfig = {}
    }
    return {
      id: flowId,
      sessionId: row.session_id as string,
      flowMode: (row.flow_mode as WritingFlowMode) ?? 'interactive',
      step: row.step as WritingStep,
      status: row.status as InteractiveFlowStatus,
      modeConfig,
      scenes: this.listScenes(flowId),
      namingPending,
      contextSummary: undefined
    }
  }
}