import { defineStore } from 'pinia'
import { ref, computed } from 'vue'
import type { Goal, GoalDetail, GoalStep, GoalReview, GoalFormData, GoalStepFormData, GoalReviewFormData } from '@/api/types'
import * as goalApi from '@/api/goals'

export const useGoalStore = defineStore('goal', () => {
  const goals = ref<Goal[]>([])
  const currentGoal = ref<GoalDetail | null>(null)
  const loading = ref(false)
  const error = ref('')

  const activeGoals = computed(() => goals.value.filter(g => g.status === 'active'))
  const pausedGoals = computed(() => goals.value.filter(g => g.status === 'paused'))
  const completedGoals = computed(() => goals.value.filter(g => g.status === 'completed'))

  async function fetchGoals(status?: string) {
    loading.value = true
    error.value = ''
    try {
      goals.value = await goalApi.getGoals(status)
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '获取目标列表失败'
    } finally {
      loading.value = false
    }
  }

  async function fetchGoal(id: number) {
    loading.value = true
    error.value = ''
    try {
      currentGoal.value = await goalApi.getGoal(id)
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '获取目标详情失败'
    } finally {
      loading.value = false
    }
  }

  async function createGoal(data: GoalFormData): Promise<GoalDetail | null> {
    loading.value = true
    error.value = ''
    try {
      const goal = await goalApi.createGoal(data)
      await fetchGoals()
      return goal
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '创建目标失败'
      return null
    } finally {
      loading.value = false
    }
  }

  async function updateGoal(id: number, data: Partial<GoalFormData>): Promise<GoalDetail | null> {
    loading.value = true
    error.value = ''
    try {
      const goal = await goalApi.updateGoal(id, data)
      if (currentGoal.value?.id === id) {
        currentGoal.value = { ...currentGoal.value, ...goal }
      }
      await fetchGoals()
      return goal
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '更新目标失败'
      return null
    } finally {
      loading.value = false
    }
  }

  async function deleteGoal(id: number): Promise<boolean> {
    loading.value = true
    error.value = ''
    try {
      await goalApi.deleteGoal(id)
      if (currentGoal.value?.id === id) {
        currentGoal.value = null
      }
      await fetchGoals()
      return true
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '删除目标失败'
      return false
    } finally {
      loading.value = false
    }
  }

  async function updateGoalStatus(id: number, status: string) {
    try {
      const goal = await goalApi.updateGoalStatus(id, status)
      if (currentGoal.value?.id === id) {
        currentGoal.value = { ...currentGoal.value, ...goal }
      }
      await fetchGoals()
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '更新状态失败'
    }
  }

  // ============ Steps ============

  async function createStep(goalId: number, data: GoalStepFormData): Promise<GoalStep | null> {
    try {
      const step = await goalApi.createStep(goalId, data)
      if (currentGoal.value?.id === goalId) {
        await fetchGoal(goalId)
      }
      await fetchGoals()
      return step
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '添加步骤失败'
      return null
    }
  }

  async function updateStep(goalId: number, stepId: number, data: Partial<GoalStepFormData>) {
    try {
      await goalApi.updateStep(goalId, stepId, data)
      if (currentGoal.value?.id === goalId) {
        await fetchGoal(goalId)
      }
      await fetchGoals()
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '更新步骤失败'
    }
  }

  async function deleteStep(goalId: number, stepId: number) {
    try {
      await goalApi.deleteStep(goalId, stepId)
      if (currentGoal.value?.id === goalId) {
        await fetchGoal(goalId)
      }
      await fetchGoals()
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '删除步骤失败'
    }
  }

  async function toggleStep(goalId: number, stepId: number) {
    try {
      await goalApi.toggleStep(goalId, stepId)
      if (currentGoal.value?.id === goalId) {
        await fetchGoal(goalId)
      }
      await fetchGoals()
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '切换步骤状态失败'
    }
  }

  // ============ Reviews ============

  async function createReview(goalId: number, data: GoalReviewFormData) {
    try {
      await goalApi.createReview(goalId, data)
      if (currentGoal.value?.id === goalId) {
        await fetchGoal(goalId)
      }
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '创建复盘失败'
    }
  }

  async function deleteReview(goalId: number, reviewId: number) {
    try {
      await goalApi.deleteReview(goalId, reviewId)
      if (currentGoal.value?.id === goalId) {
        await fetchGoal(goalId)
      }
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '删除复盘失败'
    }
  }

  // ============ Task Linking ============

  async function linkTask(goalId: number, taskId: number) {
    try {
      await goalApi.linkTask(goalId, taskId)
      if (currentGoal.value?.id === goalId) {
        await fetchGoal(goalId)
      }
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '关联任务失败'
    }
  }

  async function unlinkTask(goalId: number, taskId: number) {
    try {
      await goalApi.unlinkTask(goalId, taskId)
      if (currentGoal.value?.id === goalId) {
        await fetchGoal(goalId)
      }
    } catch (e: any) {
      error.value = e?.response?.data?.detail || '取消关联失败'
    }
  }

  return {
    goals, currentGoal, loading, error,
    activeGoals, pausedGoals, completedGoals,
    fetchGoals, fetchGoal, createGoal, updateGoal, deleteGoal, updateGoalStatus,
    createStep, updateStep, deleteStep, toggleStep,
    createReview, deleteReview,
    linkTask, unlinkTask,
  }
})