/**
 * Decisions store: decision processes and their steps.
 *
 * Maps to the backend /api/v1/decisions endpoints.
 */

export interface DecisionStep {
  id: string
  decision_id: string
  step_order: number
  step_type: string
  title: string | null
  description: string | null
  status: string
  vote_session_id: string | null
  outcome: string | null
  created_at: string
}

export interface Decision {
  id: string
  title: string
  description: string | null
  context: string | null
  decision_type: string
  status: string
  voting_protocol_id: string | null
  created_by_id: string | null
  created_at: string
  updated_at: string
  steps: DecisionStep[]
}

export interface DecisionCreate {
  title: string
  description?: string | null
  context?: string | null
  decision_type: string
  voting_protocol_id?: string | null
}

export interface DecisionUpdate {
  title?: string
  description?: string | null
  context?: string | null
  decision_type?: string
  voting_protocol_id?: string | null
}

export interface DecisionStepCreate {
  step_type: string
  title?: string | null
  description?: string | null
}

interface DecisionsState {
  list: Decision[]
  current: Decision | null
  loading: boolean
  error: string | null
}

export const useDecisionsStore = defineStore('decisions', {
  state: (): DecisionsState => ({
    list: [],
    current: null,
    loading: false,
    error: null,
  }),

  getters: {
    byStatus: (state) => {
      return (status: string) => state.list.filter(d => d.status === status)
    },
    activeDecisions: (state): Decision[] => {
      return state.list.filter(d =>
        d.status === 'draft' || d.status === 'qualification' || d.status === 'review' || d.status === 'voting',
      )
    },
    completedDecisions: (state): Decision[] => {
      return state.list.filter(d => d.status === 'executed' || d.status === 'closed')
    },
  },

  actions: {
    /**
     * Fetch all decisions with optional filters.
     */
    async fetchAll(params?: { decision_type?: string; status?: string }) {
      this.loading = true
      this.error = null

      try {
        const { $api } = useApi()
        const query: Record<string, string> = {}
        if (params?.decision_type) query.decision_type = params.decision_type
        if (params?.status) query.status = params.status

        this.list = await $api<Decision[]>('/decisions/', { query })
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors du chargement des decisions'
      } finally {
        this.loading = false
      }
    },

    /**
     * Fetch a single decision by ID with all its steps.
     */
    async fetchById(id: string) {
      this.loading = true
      this.error = null

      try {
        const { $api } = useApi()
        this.current = await $api<Decision>(`/decisions/${id}`)
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Decision introuvable'
      } finally {
        this.loading = false
      }
    },

    /**
     * Create a new decision.
     */
    async create(payload: DecisionCreate) {
      this.loading = true
      this.error = null

      try {
        const { $api } = useApi()
        const decision = await $api<Decision>('/decisions/', {
          method: 'POST',
          body: payload,
        })
        this.list.unshift(decision)
        return decision
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de la creation de la decision'
        throw err
      } finally {
        this.loading = false
      }
    },

    /**
     * Update an existing decision.
     */
    async update(id: string, data: DecisionUpdate) {
      this.error = null

      try {
        const { $api } = useApi()
        const updated = await $api<Decision>(`/decisions/${id}`, {
          method: 'PUT',
          body: data,
        })
        if (this.current?.id === id) this.current = updated
        const idx = this.list.findIndex(d => d.id === id)
        if (idx >= 0) this.list[idx] = updated
        return updated
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de la mise a jour de la decision'
        throw err
      }
    },

    /**
     * Delete a decision.
     */
    async delete(id: string) {
      this.error = null

      try {
        const { $api } = useApi()
        await $api(`/decisions/${id}`, { method: 'DELETE' })
        this.list = this.list.filter(d => d.id !== id)
        if (this.current?.id === id) this.current = null
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de la suppression de la decision'
        throw err
      }
    },

    /**
     * Advance the decision to the next step in its workflow.
     */
    async advance(id: string) {
      this.error = null

      try {
        const { $api } = useApi()
        const updated = await $api<Decision>(`/decisions/${id}/advance`, {
          method: 'POST',
        })
        if (this.current?.id === id) this.current = updated
        const idx = this.list.findIndex(d => d.id === id)
        if (idx >= 0) this.list[idx] = updated
        return updated
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de l\'avancement de la decision'
        throw err
      }
    },

    /**
     * Add a step to a decision.
     */
    async addStep(id: string, step: DecisionStepCreate) {
      this.error = null

      try {
        const { $api } = useApi()
        const newStep = await $api<DecisionStep>(`/decisions/${id}/steps`, {
          method: 'POST',
          body: step,
        })
        if (this.current?.id === id) {
          this.current.steps.push(newStep)
        }
        return newStep
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de l\'ajout de l\'etape'
        throw err
      }
    },

    /**
     * Create a vote session for a specific step.
     */
    async createVoteSession(decisionId: string, stepId: string) {
      this.error = null

      try {
        const { $api } = useApi()
        const result = await $api<any>(`/decisions/${decisionId}/steps/${stepId}/create-vote-session`, {
          method: 'POST',
        })
        // Refresh decision to get updated step with vote_session_id
        await this.fetchById(decisionId)
        return result
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de la creation de la session de vote'
        throw err
      }
    },

    /**
     * Clear the current decision.
     */
    clearCurrent() {
      this.current = null
    },
  },
})